240,130 research outputs found
A theoretical model for determining turbine flowmeter sensitivity
Analytical model of turbine-type flowmeter guides in the selection of valid extrapolation of available calibration data. An expression for flowmeter performance is developed to include the effects of fluid friction, bearing drag, and magnetic drag upon helical rotor design
LISA For Cosmologists: Calculating The Signal-To-Noise Ratio For Stochastic And Deterministic Sources
We present the steps to forecast the sensitivity of the Laser Interferometer Space Antenna (LISA) to both a stochastic gravitational wave background and deterministic wave sources. We show how to use these expressions to estimate the precision with which LISA can determine parameters associated with these sources. Tools are included to enable easy calculation of the signal-to-noise ratio and draw sensitivity curves. Benchmark values are given for easy comparison and checking of methods in the case of three worked examples. The first benchmark is the threshold stochastic gravitational wave background ΩGWh2 that LISA can observe. The second is the signal-to-noise ratio that LISA would observe for a binary black hole system identical to GW150914, radiating four years before merger. The third is the case of a monotone source, such as a binary that is far from merger
LISA For Cosmologists: Calculating The Signal-To-Noise Ratio For Stochastic And Deterministic Sources
We present the steps to forecast the sensitivity of the Laser Interferometer Space Antenna (LISA) to both a stochastic gravitational wave background and deterministic wave sources. We show how to use these expressions to estimate the precision with which LISA can determine parameters associated with these sources. Tools are included to enable easy calculation of the signal-to-noise ratio and draw sensitivity curves. Benchmark values are given for easy comparison and checking of methods in the case of three worked examples. The first benchmark is the threshold stochastic gravitational wave background ΩGWh2 that LISA can observe. The second is the signal-to-noise ratio that LISA would observe for a binary black hole system identical to GW150914, radiating four years before merger. The third is the case of a monotone source, such as a binary that is far from merger
Dynamic pressure limits for flat plates as related to nuclear fuel elements
Helium and air flow tests over single flat plates to determine dynamic pressure limits of nuclear fuel element plate
Hydrodynamic squeeze-film bearings for gyroscopes
Experimental tests are conducted on squeeze-film bearings by applying electricity to piezoelectric ceramics, causing vibrations at thousands or millions of Hz that are amplified and transmitted to the bearing. Rotor operation through 24,000 rpm without whirl instability proved bearing ability to support rotor weight without hydrodynamic action
Alane adsorption and dissociation on the Si(001) surface
We used DFT to study the energetics of the decomposition of alane, AlH3, on
the Si(001) surface, as the acceptor complement to PH3. Alane forms a dative
bond with the raised atoms of silicon surface dimers, via the Si atom lone
pair. We calculated the energies of various structures along the pathway of
successive dehydrogenation events following adsorption: AlH2, AlH and Al,
finding a gradual, significant decrease in energy. For each stage, we analyse
the structure and bonding, and present simulated STM images of the lowest
energy structures. Finally, we find that the energy of Al atoms incorporated
into the surface, ejecting a Si atom, is comparable to Al adatoms. These
findings show that Al incorporation is likely to be as precisely controlled as
P incorporation, if slightly less easy to achieve.Comment: Submitted to J. Phys.: Condens. Matte
High-temperature, high-pressure optical cell
The invention is an optical cell for containment of chemicals under conditions of high temperature and high pressure. The cell is formed of a vitreous silica tube, two optical windows comprising a vitreous silica rod inserted into the ends of a tube, and fused into position in the tube ends. Windows are spaced apart to form a cavity enclosed by the tube and the windows. A hole is drilled radially through the tube and into the cavity. Another vitreous silica tube is fused to the silica tube around the hole to form the stem, which is perpendicular to the long axis of the tube. The open end of the stem is used to load chemicals into the cavity. Then the stem may be sealed, and if desired, it may be shortened in order to reduce the volume of the cavity, which extends into the stem
Formation of Topological Black holes from Gravitational Collapse
We consider the gravitational collapse of a dust cloud in an asymptotically
anti de Sitter spacetime in which points connected by a discrete subgroup of an
isometry subgroup of anti de Sitter spacetime are identified. We find that
black holes with event horizons of any topology can form from the collapse of
such a cloud. The quasilocal mass parameter of such black holes is proportional
to the initial density, which can be arbitrarily small.Comment: latex, 16 pages, four postscript figure
A simplified, compact static shift register
Shift register was developed which uses only one D type flip-flop and improves packaging density by approximately 25% over the usual arrangement. Circuit is compromise between full master-slave arrangement and dynamic shift register, with limitation only of length of time that clock can be held high during new data entry
Quantum Hall ferromagnetism in graphene: a SU(4) bosonization approach
We study the quantum Hall effect in graphene at filling factors \nu = 0 and
\nu = \pm, concentrating on the quantum Hall ferromagnetic regime, within a
non-perturbative bosonization formalism. We start by developing a bosonization
scheme for electrons with two discrete degrees of freedom (spin-1/2 and
pseudospin-1/2) restricted to the lowest Landau level. Three distinct phases
are considered, namely the so-called spin-pseudospin, spin, and pseudospin
phases. The first corresponds to a quarter-filled (\nu =-1) while the others to
a half-filled (\nu = 0) lowest Landau level. In each case, we show that the
elementary neutral excitations can be treated approximately as a set of
n-independent kinds of boson excitations. The boson representation of the
projected electron density, the spin, pseudospin, and mixed spin-pseudospin
density operators are derived. We then apply the developed formalism to the
effective continuous model, which includes SU(4) symmetry breaking terms,
recently proposed by Alicea and Fisher. For each quantum Hall state, an
effective interacting boson model is derived and the dispersion relations of
the elementary excitations are analytically calculated. We propose that the
charged excitations (quantum Hall skyrmions) can be described as a coherent
state of bosons. We calculate the semiclassical limit of the boson model
derived from the SU(4) invariant part of the original fermionic Hamiltonian and
show that it agrees with the results of Arovas and co-workers for SU(N) quantum
Hall skyrmions. We briefly discuss the influence of the SU(4) symmetry breaking
terms in the skyrmion energy.Comment: 16 pages, 4 figures, final version, extended discussion about the
boson-boson interaction and its relation with quantum Hall skyrmion
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